toggle between freespace/100/fit-to-screen issue

[dericed]

This is a clean build on #735 with qt 5.15.8. In the video there's two issues, when I first select to enable the waveform (in free scale mode), which should make the image bigger, the image suddenly reduces in size even though the output should be with no scaling change. Later when changing from 100% to fit to screen, the image does not fit to screen but is a smaller size.

sample video is ffmpeg -f lavfi -i testsrc2 -t 10 yuv422p.mkv

[ElderOrb]

@dericed please recheck

[dericed]

The update works well. Thank you.
One remaining issue. When I first open the video in the player and change from Fit-to-screen to Free-Scale the zoom slider is set to 0% (which doesn't make sense, default should be 100%). Slider should be in a range of 50% to 200%, so not 0.

[ElderOrb]

@dericed ^^